Unable to add new field through PE51_CHECKTAB

Hi Guys,

I am creating a company payslip through PE51 and when i am mapping employee name field then there is no field of ename here.

So i am trying to add a new field through PE51_Checktab but unable to add it.

Please guide me how can i solve this problem and what is the steps?

Note: Am i add field as manually in PE51_checktab ??

Thanks in advance.